Measured service telephone system



Aug. 21,1923. 11A653H w. w. OWEN MEASURED SERVICE TELEPHONE SYSTEMOriginal Filed June 1551919 Patented Aug; 1 2'1 i923,

are

"WILLIAM WALTER ownn, or oar-r Pans,

nnnornro coMrnnY, or. c'nren'so,

n 'oonron nrroiv or ILLIuoIs.

3' i/rnnsunnns'nnvrcn rennetrown si's'ran;

Application filed lnne 14, 1919. Serial No. scenes Renewed'March30,1923.

To all tchomc''ma-g concern: 1 i Be "it known that LWVILLIAM WALTEROwen, a citizen of the United States or" America, and a resident ofOakPark in the county 'of Cook andState :or" 1llinois,1- have invented'certainnew and useful lmprovenients 111 Measured-Service Telephone Systerns, of which the following 'lS-ft spec1fication.

shown willnot in any: way interfere with the operation of the system,and the My invention-relates in general' to ime provements in measuredservice telephone systems, and more specifically to an improved meansfor controlling a coin-collect device of the coin first type in which apolarizedrelay is used to either collect or refund acoinkleposited by acalling subscriber. The inrention may be considered as an improvement onmy pending application S. N. 30 1-245, filed June 14:, 1919. r

A coincollector of the type which may be US .1. ically is shown anddescribed in U. S. Letters Patent #1043219, granted Novem her 5, 1912.to QFfForsberg'; Qhlthough it will be understood, that any desired typemay be used i V Y Among the objects of my invention 18 to provide asimple device, common to the lines of pay station subscribers, which maybe jointlycontrolled by the calling and called subscriber to collect acoin by one polarity of high volta e battery and whichlmay be solelycontrolled by a calling subscriber to refund a coin by means of anotherpolarity high voltage battery. I have inserted the coin controllingrelays in the trunk lines leading from the line switches of thesubscribers to the connectorswitches, the relay groups being thereforeless in number than the calling lines. A further object is to maint .inthe talkingcircuitas tree as possible from all impedance and resistancesto provide aneilectlve talking circult. It

will be understood and it will be seen that.

to interpose' selector switches between the line switches and theconnector switches group of controlling relays E may as wellbe insertedin tie trunk to the'selector as in the tr'unlrto the connector, 7 V j 1in the figure ofthe drawing I have shown calling sttion A equipped witha coin col:

Laud which I have illustrated'diagramlector such as that shown in theabove mentio ed patent having a magnet 2 adapted to be connectedto theline circuit bythe closure of the springs 3 is deposited. ihe springs 4;and 5 also open at this time to render the calling device operable, ithaving been shorted out bysaid springs until the coin is deposited.

Vl hen the calling subscriber removes his receiver to initiate a call, acircuit is completed for the line relay 6 of the individual line switchC to start the idle trunk selecting operation of said switch. Relay 6closes a-series circuit for the switching relay 7 and magnet 8 in seriesand also closes a direct circuit for magnet-8 to the private wiper 10,short circuiting relay 7. As long as the privatc wiper meets ground ontest contacts of busy lines, magnet 8 operates as a buzzer to advancethe wipers9, 10 and 11 to the first idle trunk at which time relay 7being no longer shorted by ground on wiper 10, energizes to disconnectrelay 6 and ground from the line A and extends the line through to-theline relays 12 and 13 of the seized connector H.' The circuit closed bythe energization of relay? may be traced from ground through relay 13,springs 14 and 15, springs 16,w iperx11, to and through theline ofsubstation A, and back through wiper 9, springs 17 and 18, upper windingof relay 19, springs 20 "and 21, and relay 12 to battery. It will benoticed that l have shown only a portion of a standard two wireconnector switch of the Strowger type, the only difference being that Ihaye provided a pair of line relays inv place of the standard doublewound relay common to such switches, and I have given to relay 13 thesole control of the release of the connection. This isdone to insure therelease of the switches should there'be any leak to ground on thecalling line, such as a low resistance magnet 2 which might cause adouble wound relay to hold up in case the ground at the phone happenedto be on the same side of the line as'the winding of the line relaywhich is connected to battery. Thus relay 18 must always fall back whenthe line circuit is opened regardless of whether battery has beenreversed or not and even through re lay 12 may be held up by groundthrough magnet connector it Will. be underg trainers, nssierion ro"AUTOMATIC ,,ILLmo? s,'

and 4% when a coin stood; comprises the usual rotary magnet, busy testand ringing equipment (not shown) and has direct access to thesubscribers? lines. V

Relay 12upon energizing opens one point at springs 22 in the circuit ofrelay 24; and vertical magnet 23. Belay 13' closes; the

' springs'26 to energize relay 25, which'relay in turn opens the releasemagnet circuit at springs 27 and 28, supplies ground to the ',-holdingtrunk-through; springs; 27 and 29,

' opposition: to its upper winding.

and prepares another point inthe vertical magnet circuit at springs 30.r

The ground supplied to the holding cirouit through springs 27 and 29flows through thewinding of relay 31 of the group-of re-' lays E tobattery, and. onthrough springs 32- and 33, springs 3 1. and 35, and thelower winding of relay 19 to battery, and" also through wiper 10 andrelay 7 to battery.

v Thus'relay 31 is energized, the line switch 01 is held in itsoperatedpo'si'tion, and the lower'winding of relay 19 is energized inBelay 19- requires the "combined energization of both windings assistingeach other to attract its armatures, which may then he held 'enezgizedby the lower winding alone. Relay 31 closes a circuit at springs 36 and37 for theslow relay 411, which energizes to pie pare a: circuit forrelay 40 at springs 39,

and substitutes a new holding ground circuit through springs 42 and 33for the line SWltCll' C and relay 19.

The calling subscriber may of; his calling device, first operate verti'al magnet 23 'tostep the switch Hto a desired level and then the rotarymagnet '(not shown) to stepthewipers to a desired line,

which is then automatically signalled bymeans of the usual ringingequipment.

Assuming that the called line is idle, then the called subscriber uponremoving his receiver'inresponse'to the signal, operates the.

backridge relay 4L3 in'series with the called linerto reverse theconnections ofrelays12 and 13 with regard to the talking circuit, 113--lay 13 being now connected to the upper conductor and relay 12 to thelower conductor. This reversal of relay 12. and 13 re; verses the flowof current in the calling end.

of the line circuit and therefore through the upper winding of the polarrelay 19 of ti e group E; ,RelayelQ now attracts its arrnatures' toshort circuit its upper winding to prevent further changes in currentflow from afi'ecting its energization and prepares a circuit throughsprings is and 18 from the high potentialbattery M which circuit. willlater'be completed.

Conversation will now be carried on over the heavy conductors shown,relays 19,

and 41 of the group E being held energized by the ground for the springs27 and 29' of connector H.

now means;

i switch 0 v As soon asco'nver sati'on 'iscompleted, the

release of the connection is' 'initiated'byj the hangi-ngupofthereceiverat the calling staturn to open the line circuit and to therefore openthe circuit of the line relays l2 and 13 of switchfH.

cleft closed from ground through coin collect nagnet'2yat thesubstation'and'over the lower "talking conductor through line relay 12to 1 battery and relay"12;niaytherefore hold up ifinagnet 2 is oflow-enough re sistance; However, relay l3 always deenen glzes as. soonas-tne-hne is opened regardless otany'leakto ground and opens thecircuit of relay 25; -Relay 25 closes the circuit of'the release magnet.5040fthe con:

nec'tor switch Hfat'springs and'28 and opens springs-27: and 29toQrernoveground from the releasetrunk-to the relay 3110f group E.Relay"31 falls back and closes a lt'will be noticed, aeracircuit; SI-ean circuit from ground through springsBGand' 38, springs 39, relaydlbeingst'lll energizeddue tO'ltS slow act on, and through relayjground. The current supplied by jbatteryM' is of such strength andpolarity as 'tocause the magnet 2 to direct the coin intothecollectchute and to thereby restore the springs 3, and 5 to normal. The relay41 which falls backan instant after relay 31, opens the: circuit ofrelay 4:0 atsprings 39 so that relay {L07 also falls back to removeground 7 from the release trunk to allow the line and relay 19-to assumenormal position; p i V V 'Now'in' case the called suhs crihers line werebusy, or he did not answerpor that his line is a tree line,;thenjthebattery is re versed over the talking circuit and relay 19 does notenergize-but losses the fhattery N connected through springs-.48 and4-57 to spring-5,47, In a call olithis sort, relay 31 operates thesafinemanner as in the previouscall to energize relay 41 and whenthecallinginanrestores his receiver to normal then relay- 31 operates therelay ii in the same manner ElSlJB'fOlQ ercept that inthis V casethecircuit closed the springs 16, and t'lleads through springs 45 and 455to battery ,The cnrr'entfwhich new flows throughthe-n1agnct2 frombattery-Ilia of such a. strength and polarity as to tilt the arnature ofrelay 2' to direct the coin into'the' refund-chute where it can berecovered by:

the calling man. It will be seen therefore that I have provided a veryeificientmethod of controllingthe co-llectionor refunding of acoin in anautomatic telephone. system b y a series of, relayscommon to the lines.and

' controlled over a thirds-conductor separate from theutalking circuit.

Having fully described and ascertained the features and aspects of ininvention,

what I consider to be new and desire to have protected by LettersPatent, will be pointed out in the appended claims.

ll hat lclaim as my invention is:

1. In a telephone system, a line, a coin collector for said line inwhicha coin is de-.

posited before a call and having means for collecting or refunding adeposited coin, a pair of automatic switches,;one automatic switchforextending a talking circui-t'from isaid line to the other automaticswitch," a

inatic switch to further extend the con ec-- tion, means controlledby-the other relay for controlling the release of said first automaticswitch, and means individual to said second 7 automatic switchcontrolled by said other relayover a portion of the release circuit ofthe first switch for controlling the operation of said firstmentionedmeans to; collect or refund the coin. I

2; In a telephone system, aline,a coin collectorfor :said line in-whicha coin is deposited before a call and having means for collecting orrefunding a deposited coin, a pair of automatic switches, one automaticswitch forfextending a talking circuit from said line to theotherautomatic switch, a pair of line relays for said other switch, oneconnected between one side of the talking circuit and battery and theother between the other side of the talking circuit and ground, meanscontrolledby the first relay for controlling the operation of said otherautomatic switch to further extend the connection, means controlledbythe other relay for controlling the release of said first automaticswitch, and

7 means individualto said second automatic switch controlled by saidother relay over a portion of the release circuit of the first switchfor controlling the operation of said first mentioned means to collector refund the coin when the calling subscriberopens the line circuit torelease.

said line to the otherautomatic switch, a pair of line relays for saidother switch one connected between one side of the talking circuit andbattery and the other between the other side of the talking circuit andground, a positive and a negative battery of greater potential thanthatlusedto operate the automatic switches, means controlled by thefirst relay for controlling the operation of said other automatic switchto further extend the con nection, means controlled by the other relayfor controlling the release of said first automatic switch, and meansindividual to Said second automatic switchcontrolled by said other relayover a portion of the release circuit of the switch for controlling theoperation of said first mentioned means to collect or refund the coinwhen the calling subscriber opens the line circuit to release byconnecting said positive orinegative battery to the magnet.

4. In a telephone system, a line, a coin collecting device forsaid linein which a coin is deposited before a call and having a magnet foroperating the device to collect or refund the coin, an automatic switchfor the line, a connector switch, a trunk line accessible. to saidautomaticiswitch leading to said connector switch, a pair of line relaysfor the connector switch, means controlled over said line to operate onerelay to con trol the connector to extend the connection and foroperating the other relay to control the release of the automaticswitch, a positive and a negative battery of higher potentialthan thatused to operate the switches, a relay individual to said trunk linecontrolled over a conductor separate from the talking conductors by saidlast mentioned line relay to open the line circuit to the con nectorswitch-and to connect said higher po tential positive or negativebattery to the calling line over the trunk line to operate the magnet inone direction to collect the coin and in the other direction to refundthe coin. J y

5. In a telephone system, a line, a coin collecting device for said linein which a. coin is deposited before a call and having a magnet foroperating the device to collect or refund the coin, an automatic switchfor the line, a connector switch, a trunk line no cessible to saidautomatic switch leading to said connector switch, a pair of line relaysfor the connector switch, means controlled over said line to operate onerelay to control the connector to extend th'e connection and foroperating the other relay to control the release of the automaticswitch, a positive and a negative battery of higher potential than'thatused toloperate the switches, a relay individual to said trunk linecon-- trolled "over a conductor separate from the talking conductors bysaid last mentioned line relay to open the line circuit to the connectorswitch and-to connect said higher either collected orief-unded alsocontrolled by said last relay.

potential POSTilIlVQ or negative battery to the calling line ever thetrunk line to operate theainagnet in one idlrection to collect the coinand in the other direction to retund the coin, and means forpreventingthe release ofthe automatic switch lllltll tlle com 1s 6. In atelephone system, a line, a coin collecting devlce for said 11116111which a coin is deposited before a call andhaving a magnet for operatingthe device to collect.

or refund the coin, an automatic switch for the line, a connectorswitch, a trunk line ac cessible to said automatic switch leading tosaid connector switch, a pair of linerelays for the connector switch,means controlled oversaid line cooperate one reley'to control theconnector to. extend the connection trolled over conductor line relay toopen the line circuit to the connector switch and to connect said higherpotential positive or negative battery to'the calling line over the,trunk line to operate the magnet in one direction tov collect the 7 coinand in the other direction to refund the coin, and another relaycontrolled over the trunk line by the called subscriber for de terminingwhether thecoin is-to be collectedor refunded.

'7. In a telephone system, line, a coin collecting device torsaid line,a magnet for controlling the operation of the device, an automaticswitch individual to the line, a

plurality olcther switches,said individual switch adapted to be operatedautomatically by the closure of the line to extend a talking circuit Viaany one of a plurality of trunk lines to any of said plurality of otherautomatic switches, a trunk release circuit controlled by thel'otherautomatic switch for controlling the release of said automatic switch, abattery for operating said automatio sw tches to which and magnet is nonresponsive, another battery of higher potential, means controlled overthe talking cir-- cuit for preparing a circuit for the magnet to eitherpole of said high potential 'battery, and a relay individual to the,trunk line n said talk ng circuit and controlled over sa dtrunlrrjelease, c rcu t' for completing said prepared circuit to eithercollect or r fund a 0 1i 1. a te ph ne system, a line, a .cein c1 1- ectg d i e fo fsai li e, a n gn fo on rolling the n tien Qfth device, n. maic s i i' n ivi lual' to th l ne, a plu li y o ot er a t ma ic it hes, aplurality of trunk, l nes, s d' fi s switch adapted, to: heoperated;automatically by the cl o.

sure or thelineto extendaa talking circuit ling t-he release of saidautomatic'switchpa battery for operating fsaid automatic SWItGhQS tGWhlOhsitldf'lllilgnet is non responsive, another battery ofhigher-poten' t1al,'me ans controlled over the talking cir-y' culttorprep'aring-a ClICLllll'fOl the magnet,

to either pole of said high potential battery, and a relay individual tothe trunk hnelin said talkin circuit, and controlled over said trunkrelease circuit for completing said prepared circuit to' eithercollectror refunda' coin and for preventing the releaseof the saidautomatic switch until the prepared circollected.

cult is closed 'and the coineither refunded orvia any one of.said'plurality iof trnnk lines to any of said plurality of otherautomatic switches, a trunk {releasecircuitcontrolled by the otherautomatic switch for contr'ol 9; In a telephone system, a line, a coincollectingdeyice "for said line, havinga magnet for collecting orrefunding a precleposited coin, a connector switch, an automatic switchfor the line for extending a talking circuit therefrom throughsaidconnector switch to a called line, a relay having a winding in.thetalking circuit and jointly controlled. by the calling andxcalledsubscribers to determine whether a coin is to be collected-or refunded,a-trunk release circuit for theautomatic'switch controlled by thecalling subscriber through the connector switch, and a relay common to aplurality of said automatic switches' controlled over said releasecircuit solely by the calling subscriber for operating said magnet asdetermined bythe called subscribed to either collect or refund the coin.V V

10. In" a telephone system, a line, a coin collecting device forsaid'=line, -having a magnet i'or' collecting or refunding apredeposited' coin, a connector switch, an automatic switch" for theline for extending a talking circuit therefrom-through said connectorswitch to a called line, a relay having a winding inthe talking circuitand jointly controlled by the calling and. called subscribers todeterminewhether a. coin isto be. collected or refunded, a trunkreleasecircuit for the automatic switch controlled by the callingsubscriber through the connector switch-,7 and a relay commonto aplurality of said automatic switches controlled over said releasecircuit solelyby the calling sub- 7 scribertor operating said magnet asdetermined by the called subscriber to either collect or refundthe coinbeforelthe auto-- maticlswitch is released. o 11. In a telephonesystenna line, a coin collecting .devicefor :said" line, havingadepositedcoin, a connector switch, an automet cswltch for the line forextending a magnet forcollecting .or refunding a .pre-

talking circuit therefrom through said connector switch to a calledline, a relay having a Winding in the talking circuit and jointlycontrolledjby the calling and called subscribers to-determine Whether acoin is to be collected or refunded, a trunk release circuit for theautomatic switch controlled by the calling subscriber through theconnector switch, and a relay common to axplurality of said automaticswitches controlled over said release circuit solely by the callingsubscriber for operating said magnet as determined by the calledsubscriber to either collect or refund the coin by an impulse ofincreased current.

12. In a telephone systen1, a line, a coin collecting device for theline, a magnet for controlling said device to collect or refund a coin,means including a series of automatic switches for extending a talkingcircuit to a called line a trunk release circuit for the first switch ofsaid series-separate from the talking circuit, and means controlled oversaid trunk release circuit for first collecting or refundnig a coin andthen releasing the 'first switch in the series.

13. In a telephone system, a line, a coin collecting device for theline, a magnet ior controlling said device to collector refund a coin,means including a series of automatic switches for extending a talkingcircuit to a called line, a trunk release circuit for the first switchofsaid series separate from the talking circuit, means for releasing saidtalking circuit from the first switch to the called line, and a relaycontrolled over said release circuit for momentarily holding the firstswitch from releasing after the talking circuit has been released andfor closing a circuit for said magnet to collect or refund the coinWhile the first switch is held from releasing.

Signed by me at Chicago, Cook County, Illinois, this 12th day of June,1919.

"WILLIAM WVALTER OWEN.

